While millennials seem like prime candidates for ad industry employees — they're young, hip, and know how to Tweet/Pin/Instagram/Facebook the hell out of something — there's one con to hiring a fresh batch of college graduates: their attitudes are the worst.

Those and other advertisers' quotes explain why millennials make their bosses want to go into early retirement:

"Only at the agency a few months upon graduation, a young lady walked into my office and told me her dad thought that she was underpaid," an anonymous agency exec told Digiday. "I replied that her dad should call me so that we could discuss the matter. He never called."

"You do have to speak to them a little bit like a therapist on television might speak to a patient," Marian Salzman, president of Euro RSCG Worldwide PR North America, told CBS News. "You can't be harsh. You cannot tell them you're disappointed in them. You can't really ask them to live and breathe the company. Because they're living and breathing themselves and that keeps them very busy."

"They’re a what-have-you-done-for-me-lately generation," another ad exec told Digiday. "A paycheck doesn’t seem to count as part of that what you have done. You have to give up so much more time to reviewing and patting them on the back. I can’t imagine ever asking for a performance review unless it was a way to up my salary, but I’m constantly asked for them. You do realize it’s only been four months since your last one, right?"

Andrew Leavitt, 26, provided the Wall Street Journal with a quote that's evidence of why millennials are the worst. Leavitt worked as an account planner at Ogilvy & Mather in 2010 but left shortly thereafter — too many status reports and client calls. Although he's happier at CreativeFeed, it appears as if he's already planning his next move. "I mean, what kind of millennial would work for the same company their whole life?"

An agency exec told Digiday a similar lament: "There’s a level of career impatience that used to be reserved for the “kids that were too smart for their grade,” justifying misbehavior with boredom. Now the entire grade feels too smart for their grade — and we have to manage that."

And finally, "one of our new hires sent me an email requesting dual monitors and that one of them be a large one. I simply forwarded the email to that girl’s manager suggesting that she come check out my dinky 15-inch monitor that I’m rocking."